This document reports activities and results of Task 3.3 of the Intelligent Energy Europe supported project RES4Less. This work is the initial analyses and survey of barriers for implementing cooperation mechanisms in the EU countries. This work builds on earlier Intelligent Energy Europe projects and is the result of literature surveys and discussions in the project group. Furthermore, fruitful inputs have been obtained in the stakeholder workshops carried out within the RES4Less project. Additionally, the topic has been presented and debated at two international conferences.The preliminary results were also shared and enriched by comments from other members of the RES4Less Team during internal meetings of the project.